Keystone Figure 221/222 Butterfly Valves, Keystone-EN Manuals & Guides

KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Before installation these instructions must be fully read and understood

DANGEROUS PRACTICES

Potentially dangerous practices:

• disregarding instructions

• improper use of product

• use of insufficiently qualified personnel.

Application pressure/temperature must not be
higher than the pressure/temperature limits
shown on the technical data sheet.

INTRODUCTION

The Keystone Figure 221/222 is a rubber lined
butterfly valve which has a maximum working
pressure of 16 bar over a temperature range of

-29°C to +120°C, depending on seat material.
The Figure 221/222 utilizes a molded seat
design.

FLANGE AND PIPELINE COMPATIBILITY

Keystone butterfly valves are designed for
installation between ANSI Class 125/150 flat or
raised faced flanges. Gaskets are not required.
Lined pipe, heavy wall pipe or flanges must
have a minimum allowable inside diameter at
the centered body face to clear the disc sealing
edge when opening the valve.
Weld neck flanges (flange ID approximates
flange bore) are recommended to ensure
maximum valve performance; however, slip-on
flanges may be used.
Do not weld near the valve, as this will result in
serious damage to the valve.

SAFETY RELATED INFORMATION

1. If in any doubt regarding any aspect of
Figure 221/222 valves, contact your local
Emerson sales office for guidance.

2. Only use properly qualified personnel for
installation.

3. Ensure that the pipeline is fully drained
or vented before removing the valve from
thepipeline.

4. Use appropriate protective equipment/
clothing, such as goggles, safety shoes,
industrial gloves.

5. This product is not intended for use in areas
where external fire is a potential hazard.

6. The piping design must take into account
the following factors and any other factors
which are not listed here, but known
to be relevant to the safe operation of
theinstallation.

6.1 Valve weights which are shown in

thetechnical data sheet.

6.2 Formation of condensate in gas

pipelines.

6.3 Elimination of turbulence and vortex

potential at the valve.

6.4 Pipeline vibrations.

6.5 The piping design should preclude

theoccurrence of water hammer at
thevalve.

7. The valve design has not taken into account
earthquake loading or traffic vibration.

8. The normal shelf life of the Figure 221/222
valve seat is 5 years under clean, dry
ambient and conditions without UV exposure
prior to installation.

9. Tighten all flange bolts as per the
nominated flange standards using the
diagonal sequence method.

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KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

INSTALLATION INSTRUCTIONS

Installation in pipeline

Figure 221/222 valves are bi-directional and
there is no need to identify upstream and
down stream orientation. These valves can be
installed in vertical or horizontal pipelines and
any intermediate orientation.
There is no restriction on the valve stem
position (vertical, horizontal or oblique),
although for slurry service and media, which
have a tendency to deposit sediment, the
recommended installation position is with
the stem horizontal and the lower disc edge
opening downstream.
Do not use flange gaskets or sealing
compounds. The Keystone seat face design
eliminates the need for gaskets.

MAINTENANCE

Routine maintenance or lubrication are not
required.

INSTALLATION IN AN EXISTING SYSTEM

1. Consideration should be given to the
location of the valves in the piping
system. The valve should not be placed
too close to other valves, elbows, etc.
as its performance may be affected.
Itis recommended that the valve have a
minimum of six pipe diameters upstream
and four pipe diameters downstream
between it and other valves, elbows, etc.
inthe piping system.

2. Ensure that the flanges are clean,
undamaged and compatible with the valve.

3. Check that the gap between the flanges
can accommodate the valve face to face
dimension.

4. Spread the flanges using suitable tooling
such as flange spreaders to enable ease of
insertion of the valve between the flanges.

WARNING

Do not use the valve as a lever.

9. Remove any flange spreaders that
have been used and at the same time
tighten the flange bolts “hand tight”.
Ensurethatthe valve remains centered
to the pipeline axis by slowly closing the
valve (clockwiserotation of the disc stem)
to check that adequate clearance has been
maintained between the disc edge and the
pipeline bore.

10. Re-open the valve (counter clockwise
rotation of the disc stem) and tighten all
flange bolts as per flange standards using
the diagonal sequence method.

11. Operate the valve to the desired position.

OpenFlow

Preferred mounting

EXISTING SYSTEM

1. Spread the flanges with the adequate
tooling. Insert some flange bolts to bear
the valve

2. Open the valve and remove the flange
spreads.

5. Open the valve until the disc is free of
the seat but still within the valve body
(about 5° open).

6. Loosely insert two or more flange bolts
through the holes in the lower part of the
flanges to help support the valve.

7. Carefully slide the valve between the
flanges, center the valve body with the
pipeline axis, and insert the remaining
flange bolts.

8. Open the valve fully, checking that the disc
edge does not interfere with the pipeline
bore.

3. Close the valve clockwise, return to open
position and cross-tighten all bolting.

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KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

INSTALLATION IN A NEW SYSTEM

It is common practice to use the valve to help
in alignment of the flanges prior to welding the
flanges into the pipeline. In such cases, the
following instruction applies:

1. Align both mating flanges with the valve
center line and secure in position using the
flange bolts.

2. Position the flange/valve/flange assembly in
the pipeline.

3. Tack weld the flanges to the pipeline.

4. Remove the flange bolts and the valve.

5. Finish weld the flanges to the pipeline and
allow to cool fully.

6. Follow the procedure for installation in an
existing system.

WARNING

Do not finish weld the flanges to the pipeline with
the valve still assembled to the flanges as this will
result in serious damage to the valve seat.

NEW SYSTEM

1. Center a flange-valve-flange assembly
between the pipes.

2. Tack weld the flanges to the pipes.

3. Remove the valve and finish weld.
Installthe valve according to the procedure
in the left column.

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KEYSTONE FIGURE 221/222 BUTTERFLY VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

TROUBLESHOOTING

Symptom Probable cause Solution

Valve opens only a few degrees and stops
(itwill not open to the full angle desired)
Leakage past the flange face 1. Flange bolts are not evenly torqued

Leakage in the closed position
(leakage in the pipeline)

Excessively high torque 1. Obstruction in the pipeline

Improper installation. The valve is improperly aligned Loosen the flange bolts, re-align the valve with flanges, and

re-tighten the flange bolts to correct torque per ANSI requirements

1. Loosen the flange bolts and tighten the flange bolts to the correct

2. Improper flanges

The disc is not closing fully:

1. Actuator is not properly adjusted

2.

Line pressure exceeds the valve’s working pressure

2. Scale build-up on stem or seat

torque per ANSI requirements

2. Refer to “Flange and pipeline compatibility” on page 1

1. Refer to actuator adjustment procedures

2. Reduce line pressure to the valve’s working pressure

1. Remove valve from pipeline and remove obstruction

3. Open and close the valve several times. Operate the valve at least
once a month. Check the valve seat for deterioration

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Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

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construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.

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